Aluminium complexes and use thereof as a catalyst in intramolecular ring closure reactions

An aluminum complex represented by the general formula (1′) below:

• [Al2(L1)n(L2)3-n]m (1′) wherein in the formula (1′), n represents an integer of 1 or 2;
• m represents a natural number;
• L1 represents a ligand represented by the formula (2′) below;
• L2 represents a ligand represented by the formula (3-A′) below or the formula (3-B′) below, with the proviso that when n=2, the ligand represented by the formula (2′) below is an optically active substance and when n=1, the ligand represented by the formula (3-A′) below or the formula (3-B′) below is an optically active substance,
• in the formula (2′), R1, R2, R3, R4, R1′, R2′, R3′, and R4′ each independently represent a hydrogen atom, a halogen atom, a hydroxy group, a saturated or unsaturated carbon chain, an aryl group that may have a substituent, a heterocyclic group that may have a substituent, an alkoxy group, an aryloxy group, an aralkyloxy group, a carboxy group that may be protected with a protecting group, an amino group, a substituted amino group, a nitro group, an acyl group, a substituted silyl group, a thio group, a mercapto group, or a polymer chain, and R1 and R2, R2 and R3, R3 and R4, R4 and R4′, R4′ and R3′, R3′ and R2′, and R2′ and R140 may be taken together to form a ring;
• in the formula (3-A′), R5, R6, R7, and R8 each independently represent an aryl group that may have a substituent, a heterocyclic group that may have a substituent, an aliphatic chain that may have a substituent or an alicyclic group that may have a substituent, and ring A represents a 3- to 8-membered ring that may have a hetero element, and R5 and R6, and R7 and R8 may be taken together to form a ring;
• and
• in the formula (3-B′), R5, R6, R7 and R8 have the same meanings as defined above, Y1 and Y2 each independently represent an aliphatic chain that may have a substituent, an alicyclic group that may have a substituent, an aryl group that may have a substituent, a heterocyclic group that may have a substituent, an alkoxy group, a siloxy group that may have a substituent or a carboxy group, and R5 and R6, and R7 and R8 may be taken together to form a ring.